package com.cyf.util;

import java.security.MessageDigest;

/**
 * Created by asus on 2017/5/22.
 */
public class MD5 {
    private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

    /**
     * 转换字节数组为16进制字串
     *
     * @param b
     *            字节数组
     * @return 16进制字串
     */

    public static String byteArrayToHexString(byte[] b) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++) {
            resultSb.append(byteToHexString(b[i]));
        }
        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n = 256 + n;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public String MD5Encode(String origin) {
        String resultString = null;

        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            resultString = byteArrayToHexString(md.digest(resultString
                    .getBytes()));
        } catch (Exception ex) {

        }
        return resultString;
    }

    // 用户密码MD5加密
    public static String getEncode(String passWord) {
        return new MD5().MD5Encode(passWord.substring(0, 5) + "MD5PWD"
                + passWord.substring(5));
    }

   /* public static void main(String[] args) {
        System.out.println(new MD5().MD5Encode("111111"));
    }*/

}
